How to analyze sql server performance

how to analyze sql server performance

Optimize query performance in SQL Server

Automatically Generate Performance Counter Graphs with SQL Server and R; Collecting performance counters and using SQL Server to analyze the data; Correlating Performance Monitor and SQL Server Profiler Data; Creating SQL Server performance based reports using Excel; How To Collect Performance Data With zi255.com Back to the command screen, we can verify that the symbols for SQL Server are available by running: lmvm sqlservr. We can see in the output that indeed there is a match found in our symbols for the module mentioned in the dump, in this case, the main SQL Server executable zi255.com It also provides the exact version information for SQL Server.

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It identifies performance issues and deadlocks, analyzes stored procedures, SQL Server query issues, query execution plans, and helps you understand query performance characteristics. We already mentioned a few performance guidelines, so lets dig in and show some examples and at the end of this article were going to wrap thing up with a. As early adopters of SQL Server , we are really pleased with the performance and results we achieved from using the new SQL Server features. The intelligent query processing feature has increased the speed and processing power of our business. Edilson Andrade de Albuquerque, Manager of Database Team, Itau-Unibanco. Analyze individual query performance and determine where improvements can be made. Explore performance-related Dynamic Management Objects. Investigate .

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The reason for this type of error condition to happen varies quite a bit , and it can range from CPU scheduling problems, issues with RAM chips, very heavy IO latency, linked server drivers, etc. In the worst case, the stack dumps can cause serious system instability and can trigger cluster failovers or SQL Server service restarts.

Because Microsoft owns the SQL Server source code, they are best positioned to be able to troubleshoot these unhandled conditions. As such, knowing how to do this analysis can be critical to getting quick workarounds in place while you are working with Microsoft support to find a root cause and permanent fix.

Public symbols are files provided by the software developer in this case Microsoft that give high-level information on the executable to be able to do this type of debugging. There are also private symbols which provide even more information like local variable names or source line info, but these are only accessible to the developer of the application, in this case Microsoft support.

To do this, just go to File Save Workspace and give it a name. Back to the command screen, we can verify that the symbols for SQL Server are available by running:. We can see in the output that indeed there is a match found in our symbols for the module mentioned in the dump, in this case, the main SQL Server executable sqlservr. It also provides the exact version information for SQL Server.

For example, the above screenshot identifies version Of course, you can always get the information from the server itself, but if all you have is the file available, then this is an alternative way to get it. Knowing the exact version information is important since the dump could have been generated by a bug that is specific to a version.

Keep in mind that the dump has information from all the threads active when the dump happened. The easiest way to get started is to let WinDbg analyze the dump, see if it finds an exception and take you to that context. To do this, type the following command:. There is a caveat around Non-yielding scheduler dumps. Sometimes, the stack that you get through analyze might not be the one that was not yielding. The reason for this is because, by the time the dump is generated, the task might have actually yielded.

To cover for this scenario, SQL Server copies the offending stack to a global address that we can reach on the dump. This is the command to move to that structure:. You might be thinking, where I came up with that special copiedStackInfo context. For example, you can see one blog post here. Finally, the means we want to see up to calls down the stack.

For this particular dump both stacks were the same, however, in other scenarios it could have been different. In order to follow the logical sequence of events then we need to read from the bottom-up.

In this particular call stack, we can see the following sequence of events:. The scheduler is not yielding while doing a lazy writer sweep to clear dirty pages and writing them to file. With this information, we can start looking at these different factors to try to alleviate the situation:. We run! Continuing to wait. An alternative way to navigate the dump is to search the dump for a particular string. Sure enough, I get this result:.

From that result, we know that the thread that produced the dump was So we move to that thread with this command:. Finally, same as the previous example, we can run kc and we would get the call stack that I mentioned on step 3 above. Given what we have found, this case definitely looks like a parallelism related bug but at least we know it is triggered by a parallel scan operation.

While we get a fix from support, we could apply workarounds to avoid the parallel scan through indexing, query tuning or running the query with no parallelism for now. Again, the goal is to be able to figure out quick workarounds that help you honor the SLA of your database and its applications even while dealing with product errors.

Interested in working with Warner? Schedule a tech call. In my case there is no stack dump or mini stack dump generated. Can I generate them on production anytime by any chance if so how? I ran below script , and got the call stack , how do I analyze those without connecting windbg to sql instance? Your email address will not be published.

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